Abstract
Natural antibodies to human interleukin-2 are present in sera of patients infected with human immunodeficiency virus and also, at a lower titre, in sera of healthy individuals. These antibodies could be purified by affinity-chromatography. Purified human anti-hIL-2 antibodies can interfere with lymphocyte proliferation both in the lymphokine activated killer cell assay and in the mixed lymphocyte culture. The neutralizing activity observed in vitro suggests that these antibodies play a role in the elaborate cytokine network by which the immune system regulates its response.
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